[PATCH] MIPS: Use rcu to lookup a task in mipsmt_sys_sched_setaffinity()

[Davidlohr Bueso]

The call simply looks up the corresponding task (without iterating
the tasklist), which is safe under rcu instead of the tasklist_lock.
In addition, the setaffinity counter part already does this.

Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
---
 arch/mips/kernel/mips-mt-fpaff.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/kernel/mips-mt-fpaff.c b/arch/mips/kernel/mips-mt-fpaff.c
index 1a08428eedcf..6c590ef27648 100644
--- a/arch/mips/kernel/mips-mt-fpaff.c
+++ b/arch/mips/kernel/mips-mt-fpaff.c
@@ -167,7 +167,7 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, 
unsigned int len,
                return -EINVAL;
 
        get_online_cpus();
-       read_lock(&tasklist_lock);
+       rcu_read_lock();
 
        retval = -ESRCH;
        p = find_process_by_pid(pid);
@@ -181,7 +181,7 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, 
unsigned int len,
        cpumask_and(&mask, &allowed, cpu_active_mask);
 
 out_unlock:
-       read_unlock(&tasklist_lock);
+       rcu_read_unlock();
        put_online_cpus();
        if (retval)
                return retval;
-- 
2.26.2